diff --git a/hvigor/hvigor-config.json5 b/hvigor/hvigor-config.json5
index 122677b..69b4a2d 100644
--- a/hvigor/hvigor-config.json5
+++ b/hvigor/hvigor-config.json5
@@ -1,6 +1,6 @@
 {
-  "hvigorVersion": "3.0.9",
+  "hvigorVersion": "4.1.2",
   "dependencies": {
-    "@ohos/hvigor-ohos-plugin": "3.0.9"
+    "@ohos/hvigor-ohos-plugin": "4.1.2"
   }
 }
\ No newline at end of file
diff --git a/library/src/main/ets/components/imageknife/Downsampling/BaseDownsampling.ets b/library/src/main/ets/components/imageknife/Downsampling/BaseDownsampling.ets
index 317587f..fa7add3 100644
--- a/library/src/main/ets/components/imageknife/Downsampling/BaseDownsampling.ets
+++ b/library/src/main/ets/components/imageknife/Downsampling/BaseDownsampling.ets
@@ -1,2 +1,6 @@
-/*
- * asdfasdfasdfasdfasdf*/
\ No newline at end of file
+export interface BaseDownsampling{
+  getScaleFactor(sourceWidth:number, sourceHeight:number, requestWidth:number, requestHeight:number):number
+
+
+  getSampleSizeRounding(sourceWidth:number, sourceHeight:number, requestWidth:number, requestHeight:number):number
+}
\ No newline at end of file
diff --git a/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets b/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
index 87de8a4..01fe132 100644
--- a/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
+++ b/library/src/main/ets/components/imageknife/Downsampling/DownsampleStartegy.ets
@@ -1,2 +1,79 @@
-/*
- * dsasdafasdfasdf*/
\ No newline at end of file
+import { BaseDownsampling } from './BaseDownsampling'
+
+
+export class CenterInside{
+        getScaleFactor(sourceWidth:number, sourceHeight:number,requestWidth:number, requestHeight:number):number {
+
+          return Math.min(1,FitCenter.getScaleFactor(sourceWidth, sourceHeight, requestWidth, requestHeight))
+        }
+        getSampleSizeRounding(sourceWidth:number, sourceHeight:number, requestWidth:number, requestHeight:number):SampleSizeRounding {
+            return this.getScaleFactor(sourceWidth, sourceHeight, requestWidth, requestHeight)==1
+              ?SampleSizeRounding.QUALITY
+              :FitCenter.getSampleSizeRounding(sourceWidth, sourceHeight, requestWidth, requestHeight)
+
+        }
+
+}
+/*不进行下采样*/
+export class DownsampleNone implements BaseDownsampling{
+  getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+    return 1
+  }
+
+  getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+      return SampleSizeRounding.QUALITY
+  }
+
+}
+/* 下采样使得图像的组大尺寸在给定的尺寸的1/2之间*/
+ export class  AtMost  implements BaseDownsampling{
+   getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth:number,requestHeight: number): number {
+     let maxIntegerFactor=Math.ceil(Math.max(sourceHeight/requestHeight,sourceWidth/requestWidth));
+     let lesserOrEqualSampleSize = Math.max(1,highestOneBit(maxIntegerFactor))
+     let greaterOrEqualSampleSize = lesserOrEqualSampleSize<<(lesserOrEqualSampleSize<maxIntegerFactor?1:0)
+     return 1/greaterOrEqualSampleSize
+   }
+   getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+     return SampleSizeRounding.MEMORY
+   }
+ }
+export class Atleast implements BaseDownsampling{
+    getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+        let minIntegerFactor=Math.floor(Math.min(sourceHeight/requestHeight,sourceWidth/requestWidth))
+
+      return minIntegerFactor==0?1:1/highestOneBit(minIntegerFactor)
+    }
+  getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+      return SampleSizeRounding.QUALITY
+    }
+}
+export class CenterOutside implements BaseDownsampling{
+  getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+    let widthPercentage =requestWidth/sourceWidth
+    let heightPercentage =requestHeight/sourceHeight
+    return Math.max(widthPercentage,heightPercentage)
+  }
+
+  getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+     return SampleSizeRounding.QUALITY
+  }
+
+}
+
+
+export class FitCenter{
+  public static getScaleFactor(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+    let widthPercentage =requestWidth/sourceWidth
+    let heightPercentage =requestHeight/sourceHeight
+    return Math.min(widthPercentage,heightPercentage)
+  }
+  public static  getSampleSizeRounding(sourceWidth: number, sourceHeight: number, requestWidth: number, requestHeight: number): number {
+    return SampleSizeRounding.MEMORY
+  }
+
+}
+
+export enum SampleSizeRounding{
+  MEMORY,
+  QUALITY
+}
\ No newline at end of file
diff --git a/library/src/main/ets/components/imageknife/ImageKnifeComponent.ets b/library/src/main/ets/components/imageknife/ImageKnifeComponent.ets
index 11d288a..5e4e7ec 100644
--- a/library/src/main/ets/components/imageknife/ImageKnifeComponent.ets
+++ b/library/src/main/ets/components/imageknife/ImageKnifeComponent.ets
@@ -242,6 +242,9 @@ export struct ImageKnifeComponent {
     if (this.imageKnifeOption.signature) {
       request.signature = this.imageKnifeOption.signature;
     }
+    if(this.imageKnifeOption.downsampling){
+      request.downsampleStrategy(this.imageKnifeOption.downsampling)
+    }
   }
 
   configDisplay(request: RequestOption) {
diff --git a/library/src/main/ets/components/imageknife/RequestOption.ets b/library/src/main/ets/components/imageknife/RequestOption.ets
index 0d2b0f9..97f6d48 100644
--- a/library/src/main/ets/components/imageknife/RequestOption.ets
+++ b/library/src/main/ets/components/imageknife/RequestOption.ets
@@ -60,6 +60,7 @@ import { SparkMD5 } from '../3rd_party/sparkmd5/spark-md5'
 import { FileUtils } from '../cache/FileUtils'
 import util from '@ohos.util'
 import { DataFetchResult } from './networkmanage/DataFetchResult'
+import { BaseDownsampling } from './Downsampling/BaseDownsampling'
 
 export interface Size {
   width: number,
@@ -106,6 +107,8 @@ export class RequestOption {
   uuid: string = '' // 唯一标识
   loadSrc: string | PixelMap | Resource = '';
   strategy: DiskStrategy = new AUTOMATIC();
+  //下采样相关
+  downsampType: BaseDownsampling = new BaseDownsamplings()
   dontAnimateFlag = false;
   placeholderSrc: string | PixelMap | Resource | undefined = undefined;
   placeholderFunc: AsyncSuccess<ImageKnifeData> | undefined = undefined;
@@ -502,6 +505,10 @@ export class RequestOption {
     this.gpuEnabled = true;
     return this;
   }
+  downsampleStrategy(downsampType: ESObject){
+    this.downsampType = downsampType
+    return this;
+  }
 
   // 占位图解析成功
   placeholderOnComplete = (imageKnifeData:ImageKnifeData) => {
diff --git a/library/src/main/ets/components/imageknife/interface/IParseImage.ets b/library/src/main/ets/components/imageknife/interface/IParseImage.ets
index 9713810..2b6d37c 100644
--- a/library/src/main/ets/components/imageknife/interface/IParseImage.ets
+++ b/library/src/main/ets/components/imageknife/interface/IParseImage.ets
@@ -13,8 +13,10 @@
  * limitations under the License.
  */
 import { BusinessError } from '@ohos.base'
+import { RequestOption } from '../RequestOption';
+
 export interface IParseImage<T> {
-  parseImage:(imageinfo:ArrayBuffer, onCompleteFunction:(value:T)=>void | PromiseLike<T>, onErrorFunction:(reason?:BusinessError|string)=>void)=>void;
+  parseImage:(imageinfo:ArrayBuffer, onCompleteFunction:(value:T)=>void | PromiseLike<T>, onErrorFunction:(reason?:BusinessError|string)=>void,request?:RequestOption)=>void;
   parseImageThumbnail:(scale:number, imageinfo:ArrayBuffer, onCompleteFunction:(value:T)=>void | PromiseLike<T>,
                        onErrorFunction:(reason?:BusinessError|string)=>void)=>void;
 }
\ No newline at end of file
diff --git a/library/src/main/ets/components/imageknife/requestmanage/RequestManager.ets b/library/src/main/ets/components/imageknife/requestmanage/RequestManager.ets
index a415276..3a76ae4 100644
--- a/library/src/main/ets/components/imageknife/requestmanage/RequestManager.ets
+++ b/library/src/main/ets/components/imageknife/requestmanage/RequestManager.ets
@@ -188,7 +188,7 @@ export class RequestManager {
           let success = (value: PixelMap) => {
             onComplete(value);
           }
-          this.mParseImageUtil.parseImage(arrayBuffer, success, onError)
+          this.mParseImageUtil.parseImage(arrayBuffer, success, onError,request)
         }
       }
     }
diff --git a/library/src/main/ets/components/imageknife/utils/ParseImageUtil.ets b/library/src/main/ets/components/imageknife/utils/ParseImageUtil.ets
index fd3cb98..2788f60 100644
--- a/library/src/main/ets/components/imageknife/utils/ParseImageUtil.ets
+++ b/library/src/main/ets/components/imageknife/utils/ParseImageUtil.ets
@@ -16,15 +16,14 @@
 import { IParseImage } from '../interface/IParseImage'
 import image from '@ohos.multimedia.image';
 import { BusinessError } from '@ohos.base'
-import taskpool from '@ohos.taskpool';
-import { LogUtil } from './LogUtil';
+import { RequestOption } from '../RequestOption';
 
 export class ParseImageUtil implements IParseImage<PixelMap> {
-  parseImage(imageinfo: ArrayBuffer, onCompleteFunction: (value: PixelMap) => void | PromiseLike<PixelMap>, onErrorFunction: (reason?: BusinessError | string) => void) {
-    this.parseImageThumbnail(1, imageinfo, onCompleteFunction, onErrorFunction)
+  parseImage(imageinfo: ArrayBuffer, onCompleteFunction: (value: PixelMap) => void | PromiseLike<PixelMap>, onErrorFunction: (reason?: BusinessError | string) => void,request?:RequestOption) {
+    this.parseImageThumbnail(1, imageinfo, onCompleteFunction, onErrorFunction,request)
   }
 
-  parseImageThumbnail(scale: number, imageinfo: ArrayBuffer, onCompleteFunction: (value: PixelMap) => void | PromiseLike<PixelMap>, onErrorFunction: (reason?: BusinessError | string) => void) {
+  parseImageThumbnail(scale: number, imageinfo: ArrayBuffer, onCompleteFunction: (value: PixelMap) => void | PromiseLike<PixelMap>, onErrorFunction: (reason?: BusinessError | string) => void,request?:RequestOption) {
 
     let imageSource: image.ImageSource = image.createImageSource(imageinfo); // 步骤一：文件转为pixelMap 然后变换 给Image组件
     imageSource.getImageInfo().then((value) => {
@@ -38,6 +37,15 @@ export class ParseImageUtil implements IParseImage<PixelMap> {
         editable: true,
         desiredSize: defaultSize
       };
+      const b = new Downsamper(imageinfo, hValue, wValue, requ,request)
+      let options: image.DecodingOptions = {
+        editable: true,
+        desiredSize: {
+          height: b.targetHeight,
+          width: b.targetWidth
+        }
+      };
+
 
       imageSource.createPixelMap(opts).then((pixelMap: image.PixelMap) => {
         onCompleteFunction(pixelMap);